This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A096835 #8 Nov 16 2019 20:09:11 %S A096835 3,2,3,2,2,2,1,3,2,2,0,0,1,3,3,0,2,2,2,3,2,4,1,3,3,2,3,2,1,2,2,1,0,1, %T A096835 2,5,2,3,0,2,4,1,0,3,3,2,2,1,3,3,2,1,2,3,2,2,5,0,3,2,2,3,4,0,1,3,0,1, %U A096835 4,0,2,1,1,2,3,2,3,1,2,3,3,0,0,1,2,2,2,2,2,2,5,3,0,1,6,1,4,5,1,2,3,2,1,1,2 %N A096835 Number of primes in the neighborhood of 3^n with radius ceiling(log(3^n)). %F A096835 a(n) equals almost A096509(3^n) >= a(n) because here only primes are counted, the true prime powers not. %Y A096835 Cf. A096509-A096523, A096830-A096840. %K A096835 nonn %O A096835 1,1 %A A096835 _Labos Elemer_, Jul 14 2004